Replicate LayoutTestRuntimeFlags across secondary window renderers.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index b7c7960c731017017ef8d4878d20c9cbb7149136..a3eed8757094b8a0fa138f41b3d7237fbec46edd 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -529,20 +529,8 @@ void BlinkTestRunner::OnLayoutTestRuntimeFlagsChanged(
   if (!is_main_window_)
     return;
 
-  // Message needs to be send via a local frame to eventually reach
-  // WebContentsObserver via OnMessage(..., RenderFrameHost*) overload - this
-  // lets BlinkTestController figure out the originator of the message.
-  RenderFrame* local_frame = nullptr;
-  for (WebFrame* frame = render_view()->GetWebView()->mainFrame(); frame;
-       frame = frame->traverseNext(false)) {
-    if (frame->isWebLocalFrame()) {
-      local_frame = RenderFrame::FromWebFrame(frame);
-      break;
-    }
-  }
-  DCHECK(local_frame);
-  Send(new ShellViewHostMsg_LayoutTestRuntimeFlagsChanged(
-      local_frame->GetRoutingID(), changed_values));
+  RenderThread::Get()->Send(
+      new LayoutTestHostMsg_LayoutTestRuntimeFlagsChanged(changed_values));

[Łukasz Anforowicz, 2016/04/15 20:17:51]

dcheng@ was (rightfully) unhappy about the shape of the old code.  Hopefully the
new code makes everyone happier :-)

 }
 
 void BlinkTestRunner::TestFinished() {